ACE/apps/JAWS2/JAWS/Cache_Hash_T.cpp

   1 #ifndef JAWS_CACHE_HASH_T_CPP
   2 #define JAWS_CACHE_HASH_T_CPP
   3
   4 #include "JAWS/Cache_Hash_T.h"
   5 #include "JAWS/Hash_Bucket_T.h"
   6
   7 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> unsigned long
   8 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::hash (const EXT_ID &ext_id) const
   9 {
  10   return HASH_FUNC (ext_id) % this->size_;
  11 }
  12
  13 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> bool
  14 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::isprime (size_t number) const
  15 {
  16   size_t d = 3;
  17
  18   if (number <= 2) return (number == 2);
  19
  20   if (number % 2 == 0) return 0;
  21
  22   while (d <= number/d)
  23     {
  24       if (number % d == 0) return 0;
  25       d += 2;
  26     }
  27
  28   return 1;
  29 }
  30
  31 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
  32 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::new_cachebucket (size_t hash_idx)
  33 {
  34   if (this->hashtable_[hash_idx] == 0)
  35     {
  36       size_t alloc_size = sizeof (CACHE_BUCKET_MANAGER);
  37       ACE_NEW_MALLOC_RETURN (this->hashtable_[hash_idx],
  38                              (CACHE_BUCKET_MANAGER *)
  39                              this->allocator_->malloc (alloc_size),
  40                              CACHE_BUCKET_MANAGER (this->allocator_), -1);
  41     }
  42
  43   return 0;
  44 }
  45
  46 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC>
  47 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::JAWS_Cache_Hash (ACE_Allocator *alloc,
  48                                                           size_t size)
  49   : allocator_ (alloc),
  50     hashtable_ (0)
  51 {
  52   while (!this->isprime (size))
  53     size++;
  54
  55   this->size_ = size;
  56
  57   if (this->allocator_ == 0)
  58     this->allocator_ = ACE_Allocator::instance ();
  59
  60   size_t memsize = this->size_ * sizeof (CACHE_BUCKET_MANAGER *);
  61
  62   this->hashtable_
  63     = (CACHE_BUCKET_MANAGER **) this->allocator_->malloc (memsize);
  64
  65   if (this->hashtable_)
  66     {
  67       for (size_t i = 0; i < this->size_; i++)
  68         this->hashtable_[i] = 0;
  69     }
  70   else
  71     {
  72       this->size_ = 0;
  73       // should indicate something is wrong to the user.
  74     }
  75 }
  76
  77 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC>
  78 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::~JAWS_Cache_Hash ()
  79 {
  80   if (this->hashtable_)
  81     {
  82       for (size_t i = 0; i < this->size_; i++)
  83         {
  84           if (this->hashtable_[i])
  85             {
  86               ACE_DES_FREE_TEMPLATE3(this->hashtable_[i],
  87                                      this->allocator_->free,
  88                                      JAWS_Hash_Bucket_Manager,
  89                                      EXT_ID,
  90                                      JAWS_Cache_Object *,
  91                                      EQ_FUNC);
  92
  93
  94
  95
  96               this->hashtable_[i] = 0;
  97             }
  98         }
  99       this->allocator_->free (this->hashtable_);
 100       this->hashtable_ = 0;
 101     }
 102
 103   this->allocator_ = 0;
 104 }
 105
 106 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 107 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::find (const EXT_ID &ext_id) const
 108 {
 109   unsigned long hash_idx = this->hash (ext_id);
 110
 111   if (this->hashtable_[hash_idx] == 0)
 112     return -1;
 113
 114   return this->hashtable_[hash_idx]->find (ext_id);
 115 }
 116
 117 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 118 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::find (const EXT_ID &ext_id,
 119                                                 JAWS_Cache_Object *&int_id) const
 120 {
 121   unsigned long hash_idx = this->hash (ext_id);
 122
 123   if (this->hashtable_[hash_idx] == 0)
 124     return -1;
 125
 126   return this->hashtable_[hash_idx]->find (ext_id, int_id);
 127 }
 128
 129 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 130 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::bind (const EXT_ID &ext_id,
 131                                                 JAWS_Cache_Object *const &int_id)
 132 {
 133   int result;
 134   unsigned long hash_idx = this->hash (ext_id);
 135
 136   if (this->hashtable_[hash_idx] == 0)
 137     {
 138       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 139
 140       if (this->new_cachebucket (hash_idx) == -1)
 141         return -1;
 142
 143       result = this->hashtable_[hash_idx]->bind (ext_id, int_id);
 144     }
 145   else
 146     result = this->hashtable_[hash_idx]->bind (ext_id, int_id);
 147
 148   return result;
 149 }
 150
 151 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 152 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::trybind (const EXT_ID &ext_id,
 153                                                    JAWS_Cache_Object *&int_id)
 154 {
 155   int result;
 156   unsigned long hash_idx = this->hash (ext_id);
 157
 158   if (this->hashtable_[hash_idx] == 0)
 159     {
 160       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 161
 162       if (this->new_cachebucket (hash_idx) == -1)
 163         return -1;
 164
 165       result = this->hashtable_[hash_idx]->trybind (ext_id, int_id);
 166     }
 167   else
 168     result = this->hashtable_[hash_idx]->trybind (ext_id, int_id);
 169
 170   return result;
 171 }
 172
 173 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 174 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::rebind (const EXT_ID &ext_id,
 175                                                   JAWS_Cache_Object *const &int_id,
 176                                                   EXT_ID &old_ext_id,
 177                                                   JAWS_Cache_Object *&old_int_id)
 178 {
 179   int result;
 180   unsigned long hash_idx = this->hash (ext_id);
 181
 182   if (this->hashtable_[hash_idx] == 0)
 183     {
 184       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 185
 186       if (this->new_cachebucket (hash_idx) == -1)
 187         return -1;
 188
 189       result = this->hashtable_[hash_idx]->rebind (ext_id, int_id,
 190                                                    old_ext_id, old_int_id);
 191     }
 192   else
 193     result = this->hashtable_[hash_idx]->rebind (ext_id, int_id,
 194                                                  old_ext_id, old_int_id);
 195
 196   return result;
 197 }
 198
 199
 200 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 201 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::unbind (const EXT_ID &ext_id)
 202 {
 203   unsigned long hash_idx = this->hash (ext_id);
 204
 205   if (this->hashtable_[hash_idx] == 0)
 206     return -1;
 207
 208   return this->hashtable_[hash_idx]->unbind (ext_id);
 209 }
 210
 211 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 212 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::unbind (const EXT_ID &ext_id,
 213                                                   JAWS_Cache_Object *&int_id)
 214 {
 215   unsigned long hash_idx = this->hash (ext_id);
 216
 217   if (this->hashtable_[hash_idx] == 0)
 218     return -1;
 219
 220   return this->hashtable_[hash_idx]->unbind (ext_id, int_id);
 221 }
 222
 223
 224 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> size_t
 225 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::size () const
 226 {
 227   return this->size_;
 228 }
 229
 230
 231
 232 #endif /* JAWS_CACHEHASH_T_CPP */